Context
Linux Ubuntu 17.10 using Wayland by default, graphic card upgrade with a single DVI-I output. Monitor is connected via its VGA (D-SUB DE-15) pin.
Issue
Monitor native resolution is not properly detected. DDC informations are not transmitted anymore through VGA/DVI adaptor.
A good tutorial is availlable online for a slighly different configuration. A copy of the document is provided at the end of that post (Document).
Hardware
Steps
1. Deactive Wayland => switch to X
Terminal:
echo $XDG_SESSION_TYPE => wayland
File /etc/gdm3/custom.conf décommenter l’inactivation de Wayland
[daemon]
# Uncomment the line below to force the login screen to use Xorg
WaylandEnable=false
Reboot de session graphique
Checking
echo $XDG_SESSION_TYPE => x11
2. VESA CVT mode lines values
Terminal:
> cvt 1440 900 75
1440x900 74.98 Hz (CVT 1.30MA) hsync: 70.64 kHz; pclk: 136.75 MHz
Modeline "1440x900_75.00" 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync
3. xorg.conf file generation using Nvidia driver
Terminal:
> sudo nvidia-config
Returns
WARNING: Unable to locate/open X configuration file
New X configuration file written to '/etc/X11/xorg.conf'
Nvidia X server configuration program
In X server Display Configuration tab
X Server Display Configuration > Save to X configuration file
DO NOT MERGE
4. Xorg.conf custom
Edit /etc/X11/xorg.conf
editions are in “Monitor” and “Screen” sections original remain as comments for educational purposes
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 384.69 (buildd@lgw01-amd64-056) Tue Oct 10 10:21:06 UTC 2017
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
Section "Files"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
# HorizSync source: builtin, VertRefresh source: builtin
Identifier "Monitor0"
# VendorName "Unknown"
VendorName "ACR"
# ModelName "CRT-0"
ModelName "AL1917W"
# HorizSync 28.0 - 55.0
HorizSync 31 - 84
# VertRefresh 43.0 - 72.0
VertRefresh 56 - 76
Option "DPMS"
Mode "1440x900_75.00"
DotClock 136.75
HTimings 1440 1536 1688 1936
VTimings 900 903 909 942
Flags "-hsync" "+vsync"
EndMode
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 960"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "CRT-0"
# Option "metamodes" "1360x768_60_0 +0+0"
Option "metamodes" "1440x900_75_0 +0+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection`
Reboot
5. Resolution setup
In Ubuntu Center > Parameters > Display > Screen resolution
choose:
> 1440 x 900
Sources
General process
Link to document by Alexander on Askubuntu
